Rapid increases in heat would be due to the lack of cool conditioned air being supplied to the flight deck as the flight deck area recieves conditioned air from the LH pack (as opposed to conditioned air & recirculated air for the cabin) which assists in equipment cooling(remember ther is a large amount of electronic equipment in the cockpit that require cooling).
Also by nature the flight deck will suffer from solar heating as there is a large amount of window area in the flight deck.
The flight deck will not benefit from any real "draughts" from the Fwd outflow valve (if fitted) as it is connected to the equipment cooling exhaust and is controlled by the recirculation fan switch position and aft outflow valve position.The equipment cooling valve outlet will have been closed until cabin differential pressure can be reduced to 2.5psi (this will cause a rapid rise in cockpit temps),once achieved this will be the major outlet for the forward cabin to atmosphere and will provide some ventilitation.
Regards DDG
Last edited by DDG; 3rd March 2004 at 08:16.